/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include "mozilla/dom/MathMLElement.h" #include "base/compiler_specific.h" #include "mozilla/dom/BindContext.h" #include "mozilla/ArrayUtils.h" #include "mozilla/FontPropertyTypes.h" #include "mozilla/StaticPrefs_mathml.h" #include "mozilla/TextUtils.h" #include "nsGkAtoms.h" #include "nsIContentInlines.h" #include "nsITableCellLayout.h" // for MAX_COLSPAN / MAX_ROWSPAN #include "nsCSSValue.h" #include "nsMappedAttributes.h" #include "nsStyleConsts.h" #include "mozilla/dom/Document.h" #include "nsPresContext.h" #include "mozAutoDocUpdate.h" #include "nsIScriptError.h" #include "nsContentUtils.h" #include "nsIURI.h" #include "mozilla/EventDispatcher.h" #include "mozilla/EventStates.h" #include "mozilla/MappedDeclarations.h" #include "mozilla/dom/MathMLElementBinding.h" using namespace mozilla; using namespace mozilla::dom; //---------------------------------------------------------------------- // nsISupports methods: NS_IMPL_ISUPPORTS_INHERITED(MathMLElement, MathMLElementBase, Link) static nsresult ReportLengthParseError(const nsString& aValue, Document* aDocument) { AutoTArray arg = {aValue}; return nsContentUtils::ReportToConsole( nsIScriptError::errorFlag, NS_LITERAL_CSTRING("MathML"), aDocument, nsContentUtils::eMATHML_PROPERTIES, "LengthParsingError", arg); } static nsresult ReportParseErrorNoTag(const nsString& aValue, nsAtom* aAtom, Document* aDocument) { AutoTArray argv = {aValue, nsDependentAtomString(aAtom)}; return nsContentUtils::ReportToConsole( nsIScriptError::errorFlag, NS_LITERAL_CSTRING("MathML"), aDocument, nsContentUtils::eMATHML_PROPERTIES, "AttributeParsingErrorNoTag", argv); } MathMLElement::MathMLElement( already_AddRefed& aNodeInfo) : MathMLElementBase(std::move(aNodeInfo)), ALLOW_THIS_IN_INITIALIZER_LIST(Link(this)), mIncrementScriptLevel(false) {} MathMLElement::MathMLElement( already_AddRefed&& aNodeInfo) : MathMLElementBase(std::move(aNodeInfo)), ALLOW_THIS_IN_INITIALIZER_LIST(Link(this)), mIncrementScriptLevel(false) {} nsresult MathMLElement::BindToTree(BindContext& aContext, nsINode& aParent) { Link::ResetLinkState(false, Link::ElementHasHref()); nsresult rv = MathMLElementBase::BindToTree(aContext, aParent); NS_ENSURE_SUCCESS(rv, rv); // FIXME(emilio): Probably should be composed, this uses all the other link // infrastructure. if (Document* doc = aContext.GetUncomposedDoc()) { doc->RegisterPendingLinkUpdate(this); } // Set the bit in the document for telemetry. if (Document* doc = aContext.GetComposedDoc()) { doc->SetMathMLEnabled(); } return rv; } void MathMLElement::UnbindFromTree(bool aNullParent) { // Without removing the link state we risk a dangling pointer // in the mStyledLinks hashtable Link::ResetLinkState(false, Link::ElementHasHref()); MathMLElementBase::UnbindFromTree(aNullParent); } bool MathMLElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute, const nsAString& aValue, nsIPrincipal* aMaybeScriptedPrincipal, nsAttrValue& aResult) { MOZ_ASSERT(IsMathMLElement()); if (aNamespaceID == kNameSpaceID_None) { if (aAttribute == nsGkAtoms::color || aAttribute == nsGkAtoms::mathcolor_ || aAttribute == nsGkAtoms::background || aAttribute == nsGkAtoms::mathbackground_) { return aResult.ParseColor(aValue); } if (aAttribute == nsGkAtoms::tabindex) { return aResult.ParseIntValue(aValue); } if (mNodeInfo->Equals(nsGkAtoms::mtd_)) { if (aAttribute == nsGkAtoms::columnspan_) { aResult.ParseClampedNonNegativeInt(aValue, 1, 1, MAX_COLSPAN); return true; } if (aAttribute == nsGkAtoms::rowspan) { aResult.ParseClampedNonNegativeInt(aValue, 1, 0, MAX_ROWSPAN); return true; } } } return MathMLElementBase::ParseAttribute(aNamespaceID, aAttribute, aValue, aMaybeScriptedPrincipal, aResult); } // https://mathml-refresh.github.io/mathml-core/#global-attributes static Element::MappedAttributeEntry sGlobalAttributes[] = { {nsGkAtoms::dir}, {nsGkAtoms::mathbackground_}, {nsGkAtoms::mathcolor_}, {nsGkAtoms::mathsize_}, {nsGkAtoms::mathvariant_}, {nsGkAtoms::scriptlevel_}, // XXXfredw: Also map displaystyle to CSS math-style? {nullptr}}; // XXXfredw(bug 1548471): Add a runtime flag to disable these attributes. static Element::MappedAttributeEntry sDeprecatedScriptAttributes[] = { {nsGkAtoms::scriptminsize_}, {nsGkAtoms::scriptsizemultiplier_}, {nullptr}}; static Element::MappedAttributeEntry sDeprecatedStyleAttributes[] = { {nsGkAtoms::background}, {nsGkAtoms::color}, {nsGkAtoms::fontfamily_}, {nsGkAtoms::fontsize_}, {nsGkAtoms::fontstyle_}, {nsGkAtoms::fontweight_}, {nullptr}}; bool MathMLElement::IsAttributeMapped(const nsAtom* aAttribute) const { MOZ_ASSERT(IsMathMLElement()); static const MappedAttributeEntry* const globalMap[] = { sGlobalAttributes, sDeprecatedScriptAttributes}; static const MappedAttributeEntry* const styleMap[] = { sDeprecatedStyleAttributes}; return FindAttributeDependence(aAttribute, globalMap) || (!StaticPrefs::mathml_deprecated_style_attributes_disabled() && FindAttributeDependence(aAttribute, styleMap)) || (mNodeInfo->Equals(nsGkAtoms::mtable_) && aAttribute == nsGkAtoms::width); } nsMapRuleToAttributesFunc MathMLElement::GetAttributeMappingFunction() const { // It doesn't really matter what our tag is here, because only attributes // that satisfy IsAttributeMapped will be stored in the mapped attributes // list and available to the mapping function return &MapMathMLAttributesInto; } /* static */ bool MathMLElement::ParseNamedSpaceValue(const nsString& aString, nsCSSValue& aCSSValue, uint32_t aFlags, const Document& aDocument) { if (StaticPrefs::mathml_mathspace_names_disabled()) { return false; } int32_t i = 0; // See if it is one of the 'namedspace' (ranging -7/18em, -6/18, ... 7/18em) if (aString.EqualsLiteral("veryverythinmathspace")) { i = 1; } else if (aString.EqualsLiteral("verythinmathspace")) { i = 2; } else if (aString.EqualsLiteral("thinmathspace")) { i = 3; } else if (aString.EqualsLiteral("mediummathspace")) { i = 4; } else if (aString.EqualsLiteral("thickmathspace")) { i = 5; } else if (aString.EqualsLiteral("verythickmathspace")) { i = 6; } else if (aString.EqualsLiteral("veryverythickmathspace")) { i = 7; } else if (aFlags & PARSE_ALLOW_NEGATIVE) { if (aString.EqualsLiteral("negativeveryverythinmathspace")) { i = -1; } else if (aString.EqualsLiteral("negativeverythinmathspace")) { i = -2; } else if (aString.EqualsLiteral("negativethinmathspace")) { i = -3; } else if (aString.EqualsLiteral("negativemediummathspace")) { i = -4; } else if (aString.EqualsLiteral("negativethickmathspace")) { i = -5; } else if (aString.EqualsLiteral("negativeverythickmathspace")) { i = -6; } else if (aString.EqualsLiteral("negativeveryverythickmathspace")) { i = -7; } } if (0 != i) { aDocument.WarnOnceAbout(dom::Document::eMathML_DeprecatedMathSpaceValue); aCSSValue.SetFloatValue(float(i) / float(18), eCSSUnit_EM); return true; } return false; } // The REC says: // // "Most presentation elements have attributes that accept values representing // lengths to be used for size, spacing or similar properties. The syntax of a // length is specified as // // number | number unit | namedspace // // There should be no space between the number and the unit of a length." // // "A trailing '%' represents a percent of the default value. The default // value, or how it is obtained, is listed in the table of attributes for each // element. [...] A number without a unit is intepreted as a multiple of the // default value." // // "The possible units in MathML are: // // Unit Description // em an em (font-relative unit traditionally used for horizontal lengths) // ex an ex (font-relative unit traditionally used for vertical lengths) // px pixels, or size of a pixel in the current display // in inches (1 inch = 2.54 centimeters) // cm centimeters // mm millimeters // pt points (1 point = 1/72 inch) // pc picas (1 pica = 12 points) // % percentage of default value" // // The numbers are defined that way: // - unsigned-number: "a string of decimal digits with up to one decimal point // (U+002E), representing a non-negative terminating decimal number (a type of // rational number)" // - number: "an optional prefix of '-' (U+002D), followed by an unsigned // number, representing a terminating decimal number (a type of rational // number)" // /* static */ // XXXfredw: Deprecate legacy MathML syntax and use the CSS parser instead. // See https://github.com/mathml-refresh/mathml/issues/63 bool MathMLElement::ParseNumericValue(const nsString& aString, nsCSSValue& aCSSValue, uint32_t aFlags, Document* aDocument) { nsAutoString str(aString); str.CompressWhitespace(); // aString is const in this code... int32_t stringLength = str.Length(); if (!stringLength) { if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) { ReportLengthParseError(aString, aDocument); } return false; } if (aDocument && ParseNamedSpaceValue(str, aCSSValue, aFlags, *aDocument)) { return true; } nsAutoString number, unit; // see if the negative sign is there int32_t i = 0; char16_t c = str[0]; if (c == '-') { number.Append(c); i++; } // Gather up characters that make up the number bool gotDot = false; for (; i < stringLength; i++) { c = str[i]; if (gotDot && c == '.') { if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) { ReportLengthParseError(aString, aDocument); } return false; // two dots encountered } else if (c == '.') gotDot = true; else if (!IsAsciiDigit(c)) { str.Right(unit, stringLength - i); // some authors leave blanks before the unit, but that shouldn't // be allowed, so don't CompressWhitespace on 'unit'. break; } number.Append(c); } if (StaticPrefs::mathml_legacy_number_syntax_disabled() && gotDot && str[i - 1] == '.') { if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) { ReportLengthParseError(aString, aDocument); } return false; // Number ending with a dot. } // Convert number to floating point nsresult errorCode; float floatValue = number.ToFloat(&errorCode); if (NS_FAILED(errorCode)) { if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) { ReportLengthParseError(aString, aDocument); } return false; } if (floatValue < 0 && !(aFlags & PARSE_ALLOW_NEGATIVE)) { if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) { ReportLengthParseError(aString, aDocument); } return false; } nsCSSUnit cssUnit; if (unit.IsEmpty()) { if (!StaticPrefs::mathml_nonzero_unitless_lengths_disabled() && (aFlags & PARSE_ALLOW_UNITLESS)) { // no explicit unit, this is a number that will act as a multiplier if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) { nsContentUtils::ReportToConsole(nsIScriptError::warningFlag, NS_LITERAL_CSTRING("MathML"), aDocument, nsContentUtils::eMATHML_PROPERTIES, "UnitlessValuesAreDeprecated"); } if (aFlags & CONVERT_UNITLESS_TO_PERCENT) { aCSSValue.SetPercentValue(floatValue); return true; } else cssUnit = eCSSUnit_Number; } else { // We are supposed to have a unit, but there isn't one. // If the value is 0 we can just call it "pixels" otherwise // this is illegal. if (floatValue != 0.0) { if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) { ReportLengthParseError(aString, aDocument); } return false; } cssUnit = eCSSUnit_Pixel; } } else if (unit.EqualsLiteral("%")) { aCSSValue.SetPercentValue(floatValue / 100.0f); return true; } else if (unit.LowerCaseEqualsLiteral("em")) cssUnit = eCSSUnit_EM; else if (unit.LowerCaseEqualsLiteral("ex")) cssUnit = eCSSUnit_XHeight; else if (unit.LowerCaseEqualsLiteral("px")) cssUnit = eCSSUnit_Pixel; else if (unit.LowerCaseEqualsLiteral("in")) cssUnit = eCSSUnit_Inch; else if (unit.LowerCaseEqualsLiteral("cm")) cssUnit = eCSSUnit_Centimeter; else if (unit.LowerCaseEqualsLiteral("mm")) cssUnit = eCSSUnit_Millimeter; else if (unit.LowerCaseEqualsLiteral("pt")) cssUnit = eCSSUnit_Point; else if (unit.LowerCaseEqualsLiteral("pc")) cssUnit = eCSSUnit_Pica; else if (unit.LowerCaseEqualsLiteral("q")) cssUnit = eCSSUnit_Quarter; else { // unexpected unit if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) { ReportLengthParseError(aString, aDocument); } return false; } aCSSValue.SetFloatValue(floatValue, cssUnit); return true; } void MathMLElement::MapMathMLAttributesInto( const nsMappedAttributes* aAttributes, MappedDeclarations& aDecls) { // scriptsizemultiplier // // "Specifies the multiplier to be used to adjust font size due to changes // in scriptlevel. // // values: number // default: 0.71 // const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::scriptsizemultiplier_); if (value && value->Type() == nsAttrValue::eString && !aDecls.PropertyIsSet(eCSSProperty__moz_script_size_multiplier)) { nsAutoString str(value->GetStringValue()); str.CompressWhitespace(); // MathML numbers can't have leading '+' if (str.Length() > 0 && str.CharAt(0) != '+') { nsresult errorCode; float floatValue = str.ToFloat(&errorCode); // Negative scriptsizemultipliers are not parsed if (NS_SUCCEEDED(errorCode) && floatValue >= 0.0f) { aDecls.SetNumberValue(eCSSProperty__moz_script_size_multiplier, floatValue); } else { ReportParseErrorNoTag(str, nsGkAtoms::scriptsizemultiplier_, aDecls.Document()); } } } // scriptminsize // // "Specifies the minimum font size allowed due to changes in scriptlevel. // Note that this does not limit the font size due to changes to mathsize." // // values: length // default: 8pt // // We don't allow negative values. // Unitless and percent values give a multiple of the default value. // value = aAttributes->GetAttr(nsGkAtoms::scriptminsize_); if (value && value->Type() == nsAttrValue::eString && !aDecls.PropertyIsSet(eCSSProperty__moz_script_min_size)) { nsCSSValue scriptMinSize; ParseNumericValue(value->GetStringValue(), scriptMinSize, PARSE_ALLOW_UNITLESS | CONVERT_UNITLESS_TO_PERCENT, aDecls.Document()); if (scriptMinSize.GetUnit() == eCSSUnit_Percent) { scriptMinSize.SetFloatValue(8.0 * scriptMinSize.GetPercentValue(), eCSSUnit_Point); } if (scriptMinSize.GetUnit() != eCSSUnit_Null) { aDecls.SetLengthValue(eCSSProperty__moz_script_min_size, scriptMinSize); } } // scriptlevel // // "Changes the scriptlevel in effect for the children. When the value is // given without a sign, it sets scriptlevel to the specified value; when a // sign is given, it increments ("+") or decrements ("-") the current // value. (Note that large decrements can result in negative values of // scriptlevel, but these values are considered legal.)" // // values: ( "+" | "-" )? unsigned-integer // default: inherited // value = aAttributes->GetAttr(nsGkAtoms::scriptlevel_); if (value && value->Type() == nsAttrValue::eString && !aDecls.PropertyIsSet(eCSSProperty__moz_script_level)) { nsAutoString str(value->GetStringValue()); str.CompressWhitespace(); if (str.Length() > 0) { nsresult errorCode; int32_t intValue = str.ToInteger(&errorCode); if (NS_SUCCEEDED(errorCode)) { // This is kind of cheesy ... if the scriptlevel has a sign, // then it's a relative value and we store the nsCSSValue as an // Integer to indicate that. Otherwise we store it as a Number // to indicate that the scriptlevel is absolute. char16_t ch = str.CharAt(0); if (ch == '+' || ch == '-') { aDecls.SetIntValue(eCSSProperty__moz_script_level, intValue); } else { aDecls.SetNumberValue(eCSSProperty__moz_script_level, intValue); } } else { ReportParseErrorNoTag(str, nsGkAtoms::scriptlevel_, aDecls.Document()); } } } // mathsize // // "Specifies the size to display the token content. The values 'small' and // 'big' choose a size smaller or larger than the current font size, but // leave the exact proportions unspecified; 'normal' is allowed for // completeness, but since it is equivalent to '100%' or '1em', it has no // effect." // // values: "small" | "normal" | "big" | length // default: inherited // // fontsize // // "Specified the size for the token. Deprecated in favor of mathsize." // // values: length // default: inherited // // In both cases, we don't allow negative values. // Unitless values give a multiple of the default value. // bool parseSizeKeywords = !StaticPrefs::mathml_mathsize_names_disabled(); value = aAttributes->GetAttr(nsGkAtoms::mathsize_); if (!value) { parseSizeKeywords = false; value = aAttributes->GetAttr(nsGkAtoms::fontsize_); if (value) { aDecls.Document()->WarnOnceAbout( dom::Document::eMathML_DeprecatedStyleAttribute); } } if (value && value->Type() == nsAttrValue::eString && !aDecls.PropertyIsSet(eCSSProperty_font_size)) { nsAutoString str(value->GetStringValue()); nsCSSValue fontSize; uint32_t flags = PARSE_ALLOW_UNITLESS | CONVERT_UNITLESS_TO_PERCENT; if (parseSizeKeywords) { // Do not warn for invalid value if mathsize keywords are accepted. flags |= PARSE_SUPPRESS_WARNINGS; } if (!ParseNumericValue(str, fontSize, flags, nullptr) && parseSizeKeywords) { static const char sizes[3][7] = {"small", "normal", "big"}; static const int32_t values[MOZ_ARRAY_LENGTH(sizes)] = { NS_STYLE_FONT_SIZE_SMALL, NS_STYLE_FONT_SIZE_MEDIUM, NS_STYLE_FONT_SIZE_LARGE}; str.CompressWhitespace(); for (uint32_t i = 0; i < ArrayLength(sizes); ++i) { if (str.EqualsASCII(sizes[i])) { aDecls.Document()->WarnOnceAbout( dom::Document::eMathML_DeprecatedMathSizeValue); aDecls.SetKeywordValue(eCSSProperty_font_size, values[i]); break; } } } else if (fontSize.GetUnit() == eCSSUnit_Percent) { aDecls.SetPercentValue(eCSSProperty_font_size, fontSize.GetPercentValue()); } else if (fontSize.GetUnit() != eCSSUnit_Null) { aDecls.SetLengthValue(eCSSProperty_font_size, fontSize); } } // fontfamily // // "Should be the name of a font that may be available to a MathML renderer, // or a CSS font specification; See Section 6.5 Using CSS with MathML and // CSS for more information. Deprecated in favor of mathvariant." // // values: string // value = aAttributes->GetAttr(nsGkAtoms::fontfamily_); if (value) { aDecls.Document()->WarnOnceAbout( dom::Document::eMathML_DeprecatedStyleAttribute); } if (value && value->Type() == nsAttrValue::eString && !aDecls.PropertyIsSet(eCSSProperty_font_family)) { aDecls.SetFontFamily(value->GetStringValue()); } // fontstyle // // "Specified the font style to use for the token. Deprecated in favor of // mathvariant." // // values: "normal" | "italic" // default: normal (except on ) // // Note that the font-style property is reset in layout/style/ when // -moz-math-variant is specified. value = aAttributes->GetAttr(nsGkAtoms::fontstyle_); if (value) { aDecls.Document()->WarnOnceAbout( dom::Document::eMathML_DeprecatedStyleAttribute); if (value->Type() == nsAttrValue::eString && !aDecls.PropertyIsSet(eCSSProperty_font_style)) { nsAutoString str(value->GetStringValue()); str.CompressWhitespace(); // FIXME(emilio): This should use FontSlantStyle or what not. Or even // better, it looks deprecated since forever, we should just kill it. if (str.EqualsASCII("normal")) { aDecls.SetKeywordValue(eCSSProperty_font_style, NS_FONT_STYLE_NORMAL); } else if (str.EqualsASCII("italic")) { aDecls.SetKeywordValue(eCSSProperty_font_style, NS_FONT_STYLE_ITALIC); } } } // fontweight // // "Specified the font weight for the token. Deprecated in favor of // mathvariant." // // values: "normal" | "bold" // default: normal // // Note that the font-weight property is reset in layout/style/ when // -moz-math-variant is specified. value = aAttributes->GetAttr(nsGkAtoms::fontweight_); if (value) { aDecls.Document()->WarnOnceAbout( dom::Document::eMathML_DeprecatedStyleAttribute); if (value->Type() == nsAttrValue::eString && !aDecls.PropertyIsSet(eCSSProperty_font_weight)) { nsAutoString str(value->GetStringValue()); str.CompressWhitespace(); if (str.EqualsASCII("normal")) { aDecls.SetKeywordValue(eCSSProperty_font_weight, FontWeight::Normal().ToFloat()); } else if (str.EqualsASCII("bold")) { aDecls.SetKeywordValue(eCSSProperty_font_weight, FontWeight::Bold().ToFloat()); } } } // mathvariant // // "Specifies the logical class of the token. Note that this class is more // than styling, it typically conveys semantic intent;" // // values: "normal" | "bold" | "italic" | "bold-italic" | "double-struck" | // "bold-fraktur" | "script" | "bold-script" | "fraktur" | "sans-serif" | // "bold-sans-serif" | "sans-serif-italic" | "sans-serif-bold-italic" | // "monospace" | "initial" | "tailed" | "looped" | "stretched" // default: normal (except on ) // value = aAttributes->GetAttr(nsGkAtoms::mathvariant_); if (value && value->Type() == nsAttrValue::eString && !aDecls.PropertyIsSet(eCSSProperty__moz_math_variant)) { nsAutoString str(value->GetStringValue()); str.CompressWhitespace(); static const char sizes[19][23] = {"normal", "bold", "italic", "bold-italic", "script", "bold-script", "fraktur", "double-struck", "bold-fraktur", "sans-serif", "bold-sans-serif", "sans-serif-italic", "sans-serif-bold-italic", "monospace", "initial", "tailed", "looped", "stretched"}; static const int32_t values[MOZ_ARRAY_LENGTH(sizes)] = { NS_MATHML_MATHVARIANT_NORMAL, NS_MATHML_MATHVARIANT_BOLD, NS_MATHML_MATHVARIANT_ITALIC, NS_MATHML_MATHVARIANT_BOLD_ITALIC, NS_MATHML_MATHVARIANT_SCRIPT, NS_MATHML_MATHVARIANT_BOLD_SCRIPT, NS_MATHML_MATHVARIANT_FRAKTUR, NS_MATHML_MATHVARIANT_DOUBLE_STRUCK, NS_MATHML_MATHVARIANT_BOLD_FRAKTUR, NS_MATHML_MATHVARIANT_SANS_SERIF, NS_MATHML_MATHVARIANT_BOLD_SANS_SERIF, NS_MATHML_MATHVARIANT_SANS_SERIF_ITALIC, NS_MATHML_MATHVARIANT_SANS_SERIF_BOLD_ITALIC, NS_MATHML_MATHVARIANT_MONOSPACE, NS_MATHML_MATHVARIANT_INITIAL, NS_MATHML_MATHVARIANT_TAILED, NS_MATHML_MATHVARIANT_LOOPED, NS_MATHML_MATHVARIANT_STRETCHED}; for (uint32_t i = 0; i < ArrayLength(sizes); ++i) { if (str.LowerCaseEqualsASCII(sizes[i])) { aDecls.SetKeywordValue(eCSSProperty__moz_math_variant, values[i]); break; } } } // mathbackground // // "Specifies the background color to be used to fill in the bounding box of // the element and its children. The default, 'transparent', lets the // background color, if any, used in the current rendering context to show // through." // // values: color | "transparent" // default: "transparent" // // background // // "Specified the background color to be used to fill in the bounding box of // the element and its children. Deprecated in favor of mathbackground." // // values: color | "transparent" // default: "transparent" // value = aAttributes->GetAttr(nsGkAtoms::mathbackground_); if (!value) { value = aAttributes->GetAttr(nsGkAtoms::background); if (value) { aDecls.Document()->WarnOnceAbout( dom::Document::eMathML_DeprecatedStyleAttribute); } } if (value) { nscolor color; if (value->GetColorValue(color)) { aDecls.SetColorValueIfUnset(eCSSProperty_background_color, color); } } // mathcolor // // "Specifies the foreground color to use when drawing the components of this // element, such as the content for token elements or any lines, surds, or // other decorations. It also establishes the default mathcolor used for // child elements when used on a layout element." // // values: color // default: inherited // // color // // "Specified the color for the token. Deprecated in favor of mathcolor." // // values: color // default: inherited // value = aAttributes->GetAttr(nsGkAtoms::mathcolor_); if (!value) { value = aAttributes->GetAttr(nsGkAtoms::color); if (value) { aDecls.Document()->WarnOnceAbout( dom::Document::eMathML_DeprecatedStyleAttribute); } } nscolor color; if (value && value->GetColorValue(color)) { aDecls.SetColorValueIfUnset(eCSSProperty_color, color); } // width // // "Specifies the desired width of the entire table and is intended for // visual user agents. When the value is a percentage value, the value is // relative to the horizontal space a MathML renderer has available for the // math element. When the value is "auto", the MathML renderer should // calculate the table width from its contents using whatever layout // algorithm it chooses. " // // values: "auto" | length // default: auto // if (!aDecls.PropertyIsSet(eCSSProperty_width)) { const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::width); nsCSSValue width; // This does not handle auto and unitless values if (value && value->Type() == nsAttrValue::eString) { ParseNumericValue(value->GetStringValue(), width, 0, aDecls.Document()); if (width.GetUnit() == eCSSUnit_Percent) { aDecls.SetPercentValue(eCSSProperty_width, width.GetPercentValue()); } else if (width.GetUnit() != eCSSUnit_Null) { aDecls.SetLengthValue(eCSSProperty_width, width); } } } // dir // // Overall Directionality of Mathematics Formulas: // "The overall directionality for a formula, basically the direction of the // Layout Schemata, is specified by the dir attribute on the containing math // element (see Section 2.2 The Top-Level math Element). The default is ltr. // [...] The overall directionality is usually set on the math, but may also // be switched for individual subformula by using the dir attribute on mrow // or mstyle elements." // // Bidirectional Layout in Token Elements: // "Specifies the initial directionality for text within the token: // ltr (Left To Right) or rtl (Right To Left). This attribute should only be // needed in rare cases involving weak or neutral characters; // see Section 3.1.5.1 Overall Directionality of Mathematics Formulas for // further discussion. It has no effect on mspace." // // values: "ltr" | "rtl" // default: inherited // value = aAttributes->GetAttr(nsGkAtoms::dir); if (value && value->Type() == nsAttrValue::eString && !aDecls.PropertyIsSet(eCSSProperty_direction)) { nsAutoString str(value->GetStringValue()); static const char dirs[][4] = {"ltr", "rtl"}; static const StyleDirection dirValues[MOZ_ARRAY_LENGTH(dirs)] = { StyleDirection::Ltr, StyleDirection::Rtl}; for (uint32_t i = 0; i < ArrayLength(dirs); ++i) { if (str.LowerCaseEqualsASCII(dirs[i])) { aDecls.SetKeywordValue(eCSSProperty_direction, dirValues[i]); break; } } } } void MathMLElement::GetEventTargetParent(EventChainPreVisitor& aVisitor) { Element::GetEventTargetParent(aVisitor); GetEventTargetParentForLinks(aVisitor); } nsresult MathMLElement::PostHandleEvent(EventChainPostVisitor& aVisitor) { return PostHandleEventForLinks(aVisitor); } NS_IMPL_ELEMENT_CLONE(MathMLElement) EventStates MathMLElement::IntrinsicState() const { return Link::LinkState() | MathMLElementBase::IntrinsicState() | (mIncrementScriptLevel ? NS_EVENT_STATE_INCREMENT_SCRIPT_LEVEL : EventStates()); } bool MathMLElement::IsNodeOfType(uint32_t aFlags) const { return false; } void MathMLElement::SetIncrementScriptLevel(bool aIncrementScriptLevel, bool aNotify) { if (aIncrementScriptLevel == mIncrementScriptLevel) return; mIncrementScriptLevel = aIncrementScriptLevel; NS_ASSERTION(aNotify, "We always notify!"); UpdateState(true); } int32_t MathMLElement::TabIndexDefault() { nsCOMPtr uri; return IsLink(getter_AddRefs(uri)) ? 0 : -1; } // XXX Bug 1586011: Share logic with other element classes. bool MathMLElement::IsFocusableInternal(int32_t* aTabIndex, bool aWithMouse) { Document* doc = GetComposedDoc(); if (!doc || doc->HasFlag(NODE_IS_EDITABLE)) { // In designMode documents we only allow focusing the document. if (aTabIndex) { *aTabIndex = -1; } return false; } int32_t tabIndex = TabIndex(); if (aTabIndex) { *aTabIndex = tabIndex; } nsCOMPtr uri; if (!IsLink(getter_AddRefs(uri))) { // If a tabindex is specified at all we're focusable return HasAttr(nsGkAtoms::tabindex); } if (!OwnerDoc()->LinkHandlingEnabled()) { return false; } // Links that are in an editable region should never be focusable, even if // they are in a contenteditable="false" region. if (nsContentUtils::IsNodeInEditableRegion(this)) { if (aTabIndex) { *aTabIndex = -1; } return false; } if (aTabIndex && (sTabFocusModel & eTabFocus_linksMask) == 0) { *aTabIndex = -1; } return true; } bool MathMLElement::IsLink(nsIURI** aURI) const { bool hasHref = false; const nsAttrValue* href = mAttrs.GetAttr(nsGkAtoms::href, kNameSpaceID_None); if (href) { // MathML href // The REC says: "When user agents encounter MathML elements with both href // and xlink:href attributes, the href attribute should take precedence." hasHref = true; } else if (!StaticPrefs::mathml_xlink_disabled()) { // To be a clickable XLink for styling and interaction purposes, we require: // // xlink:href - must be set // xlink:type - must be unset or set to "" or set to "simple" // xlink:show - must be unset or set to "", "new" or "replace" // xlink:actuate - must be unset or set to "" or "onRequest" // // For any other values, we're either not a *clickable* XLink, or the end // result is poorly specified. Either way, we return false. static Element::AttrValuesArray sTypeVals[] = {nsGkAtoms::_empty, nsGkAtoms::simple, nullptr}; static Element::AttrValuesArray sShowVals[] = { nsGkAtoms::_empty, nsGkAtoms::_new, nsGkAtoms::replace, nullptr}; static Element::AttrValuesArray sActuateVals[] = { nsGkAtoms::_empty, nsGkAtoms::onRequest, nullptr}; // Optimization: check for href first for early return href = mAttrs.GetAttr(nsGkAtoms::href, kNameSpaceID_XLink); if (href && FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::type, sTypeVals, eCaseMatters) != Element::ATTR_VALUE_NO_MATCH && FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::show, sShowVals, eCaseMatters) != Element::ATTR_VALUE_NO_MATCH && FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::actuate, sActuateVals, eCaseMatters) != Element::ATTR_VALUE_NO_MATCH) { OwnerDoc()->WarnOnceAbout( dom::Document::eMathML_DeprecatedXLinkAttribute); hasHref = true; } } if (hasHref) { // Get absolute URI nsAutoString hrefStr; href->ToString(hrefStr); nsContentUtils::NewURIWithDocumentCharset(aURI, hrefStr, OwnerDoc(), GetBaseURI()); // must promise out param is non-null if we return true return !!*aURI; } *aURI = nullptr; return false; } void MathMLElement::GetLinkTarget(nsAString& aTarget) { if (StaticPrefs::mathml_xlink_disabled()) { MathMLElementBase::GetLinkTarget(aTarget); return; } const nsAttrValue* target = mAttrs.GetAttr(nsGkAtoms::target, kNameSpaceID_XLink); if (target) { OwnerDoc()->WarnOnceAbout(dom::Document::eMathML_DeprecatedXLinkAttribute); target->ToString(aTarget); } if (aTarget.IsEmpty()) { static Element::AttrValuesArray sShowVals[] = {nsGkAtoms::_new, nsGkAtoms::replace, nullptr}; bool hasDeprecatedShowAttribute = true; switch (FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::show, sShowVals, eCaseMatters)) { case ATTR_MISSING: hasDeprecatedShowAttribute = false; break; case 0: aTarget.AssignLiteral("_blank"); return; case 1: return; } if (hasDeprecatedShowAttribute) { OwnerDoc()->WarnOnceAbout( dom::Document::eMathML_DeprecatedXLinkAttribute); } OwnerDoc()->GetBaseTarget(aTarget); } } already_AddRefed MathMLElement::GetHrefURI() const { nsCOMPtr hrefURI; return IsLink(getter_AddRefs(hrefURI)) ? hrefURI.forget() : nullptr; } // XXX Bug 1586014: Share logic with other element classes. void MathMLElement::RecompileScriptEventListeners() { int32_t i, count = mAttrs.AttrCount(); for (i = 0; i < count; ++i) { const nsAttrName* name = mAttrs.AttrNameAt(i); // Eventlistenener-attributes are always in the null namespace if (!name->IsAtom()) { continue; } nsAtom* attr = name->Atom(); if (!IsEventAttributeName(attr)) { continue; } nsAutoString value; GetAttr(kNameSpaceID_None, attr, value); SetEventHandler(GetEventNameForAttr(attr), value, true); } } bool MathMLElement::IsEventAttributeNameInternal(nsAtom* aName) { // The intent is to align MathML event attributes on HTML5, so the flag // EventNameType_HTML is used here. return nsContentUtils::IsEventAttributeName(aName, EventNameType_HTML); } nsresult MathMLElement::BeforeSetAttr(int32_t aNamespaceID, nsAtom* aName, const nsAttrValueOrString* aValue, bool aNotify) { if (aNamespaceID == kNameSpaceID_None) { if (!aValue && IsEventAttributeName(aName)) { if (EventListenerManager* manager = GetExistingListenerManager()) { manager->RemoveEventHandler(GetEventNameForAttr(aName)); } } } return MathMLElementBase::BeforeSetAttr(aNamespaceID, aName, aValue, aNotify); } nsresult MathMLElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName, const nsAttrValue* aValue, const nsAttrValue* aOldValue, nsIPrincipal* aSubjectPrincipal, bool aNotify) { // It is important that this be done after the attribute is set/unset. // We will need the updated attribute value because notifying the document // that content states have changed will call IntrinsicState, which will try // to get updated information about the visitedness from Link. if (aName == nsGkAtoms::href && (aNameSpaceID == kNameSpaceID_None || (!StaticPrefs::mathml_xlink_disabled() && aNameSpaceID == kNameSpaceID_XLink))) { if (aValue && aNameSpaceID == kNameSpaceID_XLink) { OwnerDoc()->WarnOnceAbout( dom::Document::eMathML_DeprecatedXLinkAttribute); } // Note: When unsetting href, there may still be another href since there // are 2 possible namespaces. Link::ResetLinkState(aNotify, aValue || Link::ElementHasHref()); } if (aNameSpaceID == kNameSpaceID_None) { if (IsEventAttributeName(aName) && aValue) { MOZ_ASSERT(aValue->Type() == nsAttrValue::eString, "Expected string value for script body"); SetEventHandler(GetEventNameForAttr(aName), aValue->GetStringValue()); } } return MathMLElementBase::AfterSetAttr(aNameSpaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify); } JSObject* MathMLElement::WrapNode(JSContext* aCx, JS::Handle aGivenProto) { return MathMLElement_Binding::Wrap(aCx, this, aGivenProto); }